Yes, but that's not at the hiring level but at education level. You can't expect every single tech company to be representative of the population since there simply aren't that many female/black/whatever engineers

Do you think there are zero differences in races and that one race wouldn't naturally drift towards particular roles or industries more than another race? Because this point of view isn't supported by data.

Asians, a minority by every measurement, are over-represented in STEM classes to the point that Harvard and others actively discriminate against them.

Studies have shown, repeatedly, that blind hiring (stripping names from resumes, showing only experience) actually worsens diversity. This means companies generally give more opportunity to black, Asian and other minority groups.

If you measure some quantity using biased sampling, you're invariably going to see biased results. The assumption that the biased results in this scenario are due to lack of opportunity, racism, etc are unfounded. Correlation is not causation.